6. Configuration

You can turn off hardware cursor by inserting the following line in the
Device section of the XF86Config file:

Option "SWcursor"

Or turn off hardware acceleration:

Option "noaccel"

Or turn off MMIO

Option "nolinear"

Do not specify either the amount of video RAM or which chipset
in the config file. It is better to let the driver probe for this. Also
do not put any "clocks" line in the device section since these chips have
a fully programmable clock that can almost take any modeline you throw
at it. It might though fail at some specific clock values but in that case
you should just try a slightly different clock and it should work.